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    Complex evolutionary trajectories of sex chromosomes across bird taxa

    Access Status
    Open access via publisher
    Authors
    Zhou, Q.
    Zhang, J.
    Bachtrog, D.
    An, N.
    Huang, Q.
    Jarvis, E.
    Gilbert, Thomas
    Zhang, G.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zhou, Q. and Zhang, J. and Bachtrog, D. and An, N. and Huang, Q. and Jarvis, E. and Gilbert, T. et al. 2014. Complex evolutionary trajectories of sex chromosomes across bird taxa. Science. 346 (6215): pp. 1332-1342.
    Source Title
    Science
    DOI
    10.1126/science.1246338
    ISSN
    0036-8075
    School
    Department of Environment and Agriculture
    URI
    http://hdl.handle.net/20.500.11937/7987
    Collection
    • Curtin Research Publications
    Abstract

    Sex-specific chromosomes, like the W of most female birds and the Y of male mammals, usually have lost most genes owing to a lack of recombination. We analyze newly available genomes of 17 bird species representing the avian phylogenetic range, and find that more than half of them do not have as fully degenerated W chromosomes as that of chicken. We show that avian sex chromosomes harbor tremendous diversity among species in their composition of pseudoautosomal regions and degree of Z/W differentiation. Punctuated events of shared or lineage-specific recombination suppression have produced a gradient of “evolutionary strata” along the Z chromosome, which initiates from the putative avian sex-determining gene DMRT1 and ends at the pseudoautosomal region. W-linked genes are subject to ongoing functional decay after recombination was suppressed, and the tempo of degeneration slows down in older strata. Overall, we unveil a complex history of avian sex chromosome evolution.

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